Create C++11 versions of the fork, local, multicast and nonblocking examples.

example/cpp11/multicast/sender.cpp

@@ -0,0 +1,91 @@
+//
+// sender.cpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <boost/asio.hpp>
+
+constexpr short multicast_port = 30001;
+constexpr int max_message_count = 10;
+
+class sender
+{
+public:
+  sender(boost::asio::io_context& io_context,
+      const boost::asio::ip::address& multicast_address)
+    : endpoint_(multicast_address, multicast_port),
+      socket_(io_context, endpoint_.protocol()),
+      timer_(io_context),
+      message_count_(0)
+  {
+    do_send();
+  }
+
+private:
+  void do_send()
+  {
+    std::ostringstream os;
+    os << "Message " << message_count_++;
+    message_ = os.str();
+
+    socket_.async_send_to(
+        boost::asio::buffer(message_), endpoint_,
+        [this](boost::system::error_code ec, std::size_t /*length*/)
+        {
+          if (!ec && message_count_ < max_message_count)
+            do_timeout();
+        });
+  }
+
+  void do_timeout()
+  {
+    timer_.expires_after(std::chrono::seconds(1));
+    timer_.async_wait(
+        [this](boost::system::error_code ec)
+        {
+          if (!ec)
+            do_send();
+        });
+  }
+
+private:
+  boost::asio::ip::udp::endpoint endpoint_;
+  boost::asio::ip::udp::socket socket_;
+  boost::asio::steady_timer timer_;
+  int message_count_;
+  std::string message_;
+};
+
+int main(int argc, char* argv[])
+{
+  try
+  {
+    if (argc != 2)
+    {
+      std::cerr << "Usage: sender <multicast_address>\n";
+      std::cerr << "  For IPv4, try:\n";
+      std::cerr << "    sender 239.255.0.1\n";
+      std::cerr << "  For IPv6, try:\n";
+      std::cerr << "    sender ff31::8000:1234\n";
+      return 1;
+    }
+
+    boost::asio::io_context io_context;
+    sender s(io_context, boost::asio::ip::make_address(argv[1]));
+    io_context.run();
+  }
+  catch (std::exception& e)
+  {
+    std::cerr << "Exception: " << e.what() << "\n";
+  }
+
+  return 0;
+}